Before planting it is a good idea to find your USDA Zone info to estimate your garden schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

It's a good idea to figure out when it's a good idea to plant pentas by reviewing the USDA zone info for Belfast.

Planting Calendar for Pentas

Frost tolerance for pentas:	Not tolerant of frost.
When to plant:	After the last frost has passed.

It's a bad idea to plant pentas until after the last frost has passed because they require warm weather.

The earliest that you can plant pentas in Belfast is April. However, you really should wait until May if you don't want to take any chances.

The last month that you can plant pentas and expect a good harvest is probably August. Any later than that and your pentas may not have a chance to really do well. You can get started a few weeks earlier by starting your pentas indoors.

Last Frost Date

On average all chance of frost has passed is on April 15 in Belfast. In the coldest months of winter you should expect an average low temperature of -15°F.

Since the USDA zone info for Belfast is an average the actual date of last frost changes from year to year. Since half of the time in Belfast there is a last frost after April 15 be ready to cover your pentas in the event of one of those late frosts.

USDA Zone Info for Belfast

Here is the info for USDA Zone 5b.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-15°F
Highest Expected Low	-10°F

This means that on a really cold year, the coldest it will get is -15°F. On most years you should be prepared to experience lows near -10°F.

Plants to Grow in Belfast

You may be interested in your other planting guides for Belfast.